The Collaborative International Dictionary of English v.0.48:
Ruby \Ru"by\, n.; pl. Rubies. [F. rubis (cf. Pr. robi), LL.
rubinus, robinus, fr. L. rubeus red, reddish, akin to ruber.
See Rouge, red.]
1. (Min.) A precious stone of a carmine red color, sometimes
verging to violet, or intermediate between carmine and
hyacinth red. It is a red crystallized variety of
Note: Besides the true or Oriental ruby above defined, there
are the balas ruby, or ruby spinel, a red variety of
spinel, and the rock ruby, a red variety of garnet.
Of rubies, sapphires, and pearles white.
2. The color of a ruby; carmine red; a red tint.
The natural ruby of your cheeks. --Shak.
3. That which has the color of the ruby, as red wine. Hence,
a red blain or carbuncle.
4. (Print.) See Agate, n., 2. [Eng.]
5. (Zool.) Any species of South American humming birds of the
genus Clytolaema. The males have a ruby-colored throat
Ruby of arsenic, Ruby of sulphur (Chem.), a glassy
substance of a red color and a variable composition, but
always consisting chiefly of the disulphide of arsenic; --
called also ruby sulphur.
Ruby of zinc (Min.), zinc sulphide; the mineral zinc blende
Ruby silver (Min.), red silver. See under Red.